Letter to the Editor

Dear Andrew,

I enclose a photo of a cyclemotor that my son saw parked when he was
visiting Beijing. He told me that it was the only one that he had
seen. It looks like a modern Chinese bicycle with some sort of
clip-on; do you or any of the readers recognise it? Both the coil
and plastic petrol tank seem to be clipped to the frame. The
double security locks seem to suggest that it's someone's prized
possession!